id	keyword
afs-71363	soil
afs-71363	azotobacter
afs-71363	nitrogen
afs-71363	samples
afs-71363	phosphorus
afs-71363	cultures
afs-71363	acid
afs-71363	method
afs-71363	agar
afs-71363	chroococcum
afs-71363	peat